Unrated severityNVD Advisory· Published Nov 30, 2011· Updated Jun 16, 2026
CVE-2011-4317
CVE-2011-4317
Description
The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21, when the Revision 1179239 patch is in place, does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
102cpe:2.3:a:apache:http_server:1.3:*:*:*:*:*:*:*+ 100 more
- cpe:2.3:a:apache:http_server:1.3:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.1:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.10:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.11:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.12:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.13:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.14:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.15:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.16:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.17:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.18:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.19:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.2:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.20:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.22:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.23:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.24:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.25:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.26:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.27:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.28:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.29:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.3:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.30:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.31:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.32:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.33:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.34:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.35:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.36:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.37:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.38:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.39:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.4:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.41:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.42:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.5:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.6:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.65:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.68:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.7:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.8:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:1.3.9:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.28:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.28:beta:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.32:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.32:beta:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.34:beta:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.35:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.36:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.37:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.38:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.39:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.40:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.41:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.42:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.43:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.44:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.45:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.46:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.47:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.48:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.49:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.50:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.51:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.52:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.53:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.54:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.55:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.56:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.57:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.58:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.59:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.60:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.61:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.63:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.64:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.0.9:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.1:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.10:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.11:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.12:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.13:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.14:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.15:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.16:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.19:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.2:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.20:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.21:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.3:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.4:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.6:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.8:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.2.9:*:*:*:*:*:*:*
- (no CPE)range: 1.3.x-1.3.42, 2.0.x-2.0.64, 2.2.x-2.2.21
Patches
Vulnerability mechanics
References
33- thread.gmane.org/gmane.comp.apache.devel/46440nvdExploit
- community.qualys.com/blogs/securitylabs/2011/11/23/apache-reverse-proxy-bypass-issuenvdExploit
- h20000.www2.hp.com/bizsupport/TechSupport/Document.jspnvd
- kb.juniper.net/JSA10585nvd
- lists.apple.com/archives/security-announce/2012/Sep/msg00004.htmlnvd
- lists.opensuse.org/opensuse-updates/2013-02/msg00009.htmlnvd
- lists.opensuse.org/opensuse-updates/2013-02/msg00012.htmlnvd
- marc.infonvd
- marc.infonvd
- rhn.redhat.com/errata/RHSA-2012-0128.htmlnvd
- secunia.com/advisories/48551nvd
- support.apple.com/kb/HT5501nvd
- www.debian.org/security/2012/dsa-2405nvd
- www.mandriva.com/security/advisoriesnvd
- www.mandriva.com/security/advisoriesnvd
- www.oracle.com/technetwork/topics/security/cpujan2015-1972971.htmlnvd
- www.oracle.com/technetwork/topics/security/cpujul2012-392727.htmlnvd
- www.securitytracker.com/idnvd
- bugzilla.redhat.com/show_bug.cginvd
- lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r05b5357d1f6bd106f41541ee7d87aafe3f5ea4dc3e9bde5ce09baff8%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r9b4b963760a3cb5a4a70c902f325c6c0337fe51d5b8570416f8f8729%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3Envd
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